WO1996034776A1 - Stabilization system - Google Patents

Stabilization system Download PDF

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Publication number
WO1996034776A1
WO1996034776A1 PCT/FI1996/000246 FI9600246W WO9634776A1 WO 1996034776 A1 WO1996034776 A1 WO 1996034776A1 FI 9600246 W FI9600246 W FI 9600246W WO 9634776 A1 WO9634776 A1 WO 9634776A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
axle
front frame
frame
cabin
Prior art date
Application number
PCT/FI1996/000246
Other languages
French (fr)
Inventor
Pentti Hukkanen
Original Assignee
Ponsse Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8543349&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1996034776(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ponsse Oy filed Critical Ponsse Oy
Priority to AT96913543T priority Critical patent/ATE227656T1/en
Priority to AU56493/96A priority patent/AU5649396A/en
Priority to DE69624806T priority patent/DE69624806D1/en
Priority to EP96913543A priority patent/EP0824413B1/en
Priority to CA002220084A priority patent/CA2220084C/en
Publication of WO1996034776A1 publication Critical patent/WO1996034776A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D53/00—Tractor-trailer combinations; Road trains
    • B62D53/02—Tractor-trailer combinations; Road trains comprising a uniaxle tractor unit and a uniaxle trailer unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/005—Suspension locking arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/06—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid
    • B60G21/073—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G5/00—Resilient suspensions for a set of tandem wheels or axles having interrelated movements
    • B60G5/02—Resilient suspensions for a set of tandem wheels or axles having interrelated movements mounted on a single pivoted arm, e.g. the arm being rigid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2200/00—Indexing codes relating to suspension types
    • B60G2200/30—Rigid axle suspensions
    • B60G2200/32—Rigid axle suspensions pivoted
    • B60G2200/322—Rigid axle suspensions pivoted with a single pivot point and a straight axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/40—Type of actuator
    • B60G2202/41—Fluid actuator
    • B60G2202/413—Hydraulic actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/128—Damper mount on vehicle body or chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/14—Mounting of suspension arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/46—Means for locking the suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2300/00—Indexing codes relating to the type of vehicle
    • B60G2300/08—Agricultural vehicles
    • B60G2300/082—Tractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/18—Automatic control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/01—Attitude or posture control
    • B60G2800/012—Rolling condition

Definitions

  • the lateral oscillation of a vehicle also has an effect on the comfort of the driver and especially in a forestry equipment on how terrain friendly and stable the equipment is. If the lateral oscillation can be absorbed, the driving speed can be correspondingly increased, which has a direct effect on the output of the equipment .
  • the disadvantages mentioned above have been solved in different ways in forestry equipments at present. A simple way is to replace a two-wheel axle by a boggie that due to leverage slightly evens out the vibration. The acceleration on the driver can also be reduced by active suspension developed by automobile industry, but this will not remove low-frequency lateral oscillation of the cabin which is, according to studies, most detrimental to human health.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)
  • Paper (AREA)
  • Body Structure For Vehicles (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The present invention relates to a stabilization system for stabilizing the lateral oscillation of a cabin (4) of a vehicle, especially of a forest tractor. This system comprises a front (1) and rear frame (2) connected to one another in which the cabin (4) is preferably located in the front frame (1). The object of the invention is to eliminate the low-frequency vibration of the cabin in a simple and inexpensive way. The vehicle according to the invention has a front frame (1) that is arranged onto a back frame (2) with a joint (3) of at least one degree of freedom that allows the rotation of the frames essentially with respect to the longitudinal axle of the vehicle. Furthermore, the front frame (1) has at least one axle (6) suspended so that it swings essentially with respect to the longitudinal axle of the vehicle. Thus the mass to be moved with the equipment according to the invention is relatively small, whereby the need for hydraulic power in the equipment is not unreasonably great.

Description

Stabilization system
The present invention relates to a stabilization system for stabilizing the lateral oscillation of a cabin of a vehicle, especially of a forest tractor comprising a front and rear frame connected to one another, and in which the cabin is preferably located in the front frame, whereby the front frame is arranged onto the back frame with a joint of at least one degree of freedom that allows the rotation of the frames essentially with respect to the longitudinal axle of the vehicle, and that the front frame has at least one axle suspended so that it swings essentially with respect to the longitudinal axle of the vehicle.
Because of the lateral oscillation of the vehicle due to the roughness of the terrain, the driver is subjected to a low-frequency (0.5 to 10 Hz) vibration with an occasionally variable amplitude, which is found to be detrimental to the driver's health. The ill-effects of this vibration have been found to be exhaustion, lowered work efficiency and straining on the joints and the spinal column of the driver which in the long run will cause back disorders, for example. The effect of vibrations on human health has been widely discussed by Griffin (1990) and Depruis & Zerlett (1986) .
The lateral oscillation of a vehicle also has an effect on the comfort of the driver and especially in a forestry equipment on how terrain friendly and stable the equipment is. If the lateral oscillation can be absorbed, the driving speed can be correspondingly increased, which has a direct effect on the output of the equipment . The disadvantages mentioned above have been solved in different ways in forestry equipments at present. A simple way is to replace a two-wheel axle by a boggie that due to leverage slightly evens out the vibration. The acceleration on the driver can also be reduced by active suspension developed by automobile industry, but this will not remove low-frequency lateral oscillation of the cabin which is, according to studies, most detrimental to human health.
Most forestry equipments are of a two-frame structure, whereby the front and rear parts are connected to one another with a joint that enables the control of the equipment and allows the rotation of these parts with respect to each other if the axles of both parts are secured unmoveably onto the frame parts . Both ordinary axles and boggies are generally used in mechanical transmission. The boggies are normally fixedly mounted onto the frame. A boggie distributes the traction force and the surface pressure more evenly onto the terrain and slightly evens out the vibrations. Ordinary two-wheel axles can be mounted both fixedly and jointedly onto the frame, as a so- called swing axle. Commonly one axle is fixed, while the other may swing.
It is also known to place wheels onto separate shafts that can be moved by a regulating unit with respect to each other and the frame of the vehicle and thus even out the roughness of the terrain.
By using prior art solutions, a problem is how to eliminate the lateral oscillation of the vehicle actively because then the whole mass of the vehicle has to be controlled by the selected lateral oscillation removal arrangement . Depending on the frequency of the swinging, it causes a great need for absorption power which will lead to great and expensive structural solutions. The lateral oscillation of the cabin has also been reduced by suspending the cabin onto lever arms that are actively controlled by a regulating unit.
However, a problem is the complexity of the mechanism and the great need for space of the lever structure.
The object of the present invention is to eliminate the disadvantages of the prior art and provide a new solution with which detrimental lateral oscillation on the driver of a vehicle can be eliminated in a simple and inexpensive manner.
The invention is based on the idea that in order that the need for hydraulic power is not unreasonably great, the mass to be moved or the speed has to be relatively small. The object of the invention is achieved in such a manner that the stabilization system has the characteristics specified in the claims in accordance with the present invention. More exactly, this equipment according to the invention is mainly characterized in that regulating units are arranged onto the front frame jointed to the axle for controlling the axle so that lateral oscillation caused by the roughness of the terrain will be diminished or eliminated. The solution according to the invention relates to combining a frame joint allowing the mutual rotation of the front and rear frame and a swinging axle of a vehicle, a forest tractor, in particular, so that when driving on rough terrain, the suspension together with the regulating units using them and the system controlling them actively eliminate lateral oscillation of the cabin caused by the roughness of the terrain.
It is not previously known to combine, as shown in the present invention, the swing axle of a vehicle and a frame joint allowing movement in the parallel direction, and to drive actively the part of the frame of the vehicle secured onto said joints.
The elimination of the lateral oscillation of the vehicle has considerable advantages. The work comfort of the driver will get better and the vehicle can drive faster, whereby its productivity will improve. The surface pressures of tyres are distributed evenly, whereby damage to the terrain and the roots will diminish and it will be easier to move on soft terrain. The solution according to the invention makes it possible to have narrower logging roads and diminishes damages to the bodies of trees left standing. Additionally, the straining on the frame and axles of the vehicle will decrease, which will reduce the need for maintenance and repairs .
In the following, the invention will be illustrated by reference to Figure 1 which shows a schematic view of a frame structure and the suspension of axles of a forestry equipment.
The vehicle comprises two frame parts, a front frame 1 and a rear frame 2 that are jointed together by a joint 3 of at least one degree of freedom enabling the rotation of the frame parts of the vehicle in view of each other according to movement with respect to the longitudinal axle. The vehicle further comprises a cabin 4 that is connected to the front frame 1 by a passive oscillation absorber. The vehicle also comprises a boggie or an axle 5 that is secured fixedly onto the rear frame, and an axle 6 that is arranged jointedly onto the front frame 1 with a joint 7. The axle 6 jointed onto the front frame 1 can be, when needed, braced to be immoveable with cylinders 8 and 9, for example. The front frame 1 jointed onto the axle 6 can be moved with cylinders 8 and 9, as with hydraulic cylinders, with respect to the axle.
When the vehicle is moving, the cylinders 8 and 9 are active and almost pressureless, whereby the axle 6 attached to the front frame 1 with the joint 7 will not shift the movement around the longitudinal axle of the vehicle to the front frame . The movement around the longitudinal axle of the vehicle is not transmitted from the rear frame 2 to the front frame 1 as the joint 3 is in between. For controlling its regulating units the vehicle preferably comprises a hydraulic system that can be implemented with valves 10 and 11, for example. The system controls the cylinders 8 and 9 so that there is as little pressure and pressure difference as possible in the cylinders. In that case the front frame
I tries to retain such a position during driving where the cylinder powers are as small as possible, that is, it is in equilibrium. The lateral oscillation of the vehicle is eliminated if the roughness remains within the perimeter of movement of the cylinders. The mass centre of the cabin 4 will remain essentially at the centre line of the vehicle.
The hydraulic system controlling the cylinders 8 and 9 may be as shown in the figure, comprising the valves 10 and 11 or some other equilibrium sensing system known per se, such as a proportional valve system controlled by sensors and a computer. The system according to the figure operates so that when the terrain descends at the side of the cylinder 8, the mass centre of the vehicle will shift onto the same side causing the pressure to increase in a line 12 connecting the regulating unit to the hydraulic system which line will connect the left section of the valve
II for operating via a pilot operation line 13 in the system. In that case the pressure of the hydraulic system of the vehicle is directed to the cylinder 8 that will initiate a thrust motion. At the same time the oil from the cylinder 9 enters the tank in the system via lines 14 and 15 and through the left section of the valve 11. When the mass centre passes over the centre line of the vehicle, the pressure in the cylinder 8 and in the line 12 disappears, whereby the valve 11 closes and the thrust motion terminates. It is important for the operation to dimension the components of the system so that the response time of the control system is short enough and the regulation stable. The hydraulic system also comprises valves 16 and 17 the object of which is to brace the system by rendering the axle unmoveable with respect to the frame 1. The invention is not restricted to the embodiment above, but various modifications are possible within the scope of the inventive idea specified in the appended claims .

Claims

Claims
1. A stabilization system for stabilizing the lateral oscillation of a cabin (4) of a vehicle, especially of a forest tractor comprising a front (1) and rear frame (2) connected to one another, and in which the cabin (4) is preferably located in the front frame (1) , whereby the front frame (1) is arranged onto the back frame (2) with a joint (3) of at least one degree of freedom that allows the rotation of the frames essentially with respect to the longitudinal axle of the vehicle, and that the front frame has at least one axle (6) suspended so that it swings essentially with respect to the longitudinal axle of the vehicle, c h a r a c t e r i z e d in that regulating units (8, 9) are arranged onto the front frame (1) jointed to the axle (6) for controlling the axle so that lateral oscillation caused by the rough¬ ness of the terrain will be diminished or eliminated.
2. An equipment according to claim 1, c h a r¬ a c t e r i z e d in that the shift of the mass centre of the vehicle causes a thrust motion evening out the load in the regulating units (8, 9) on the side of the mass centre in the front frame (1) until equilibrium is attained.
3. An equipment according to claim 1, c h a r¬ a c t e r i z e d in that a movement reducing the length of the regulating unit is generated in the regulating unit (8, 9) on the opposite side of the mass centre in the front frame (1) , which movement is proportional to the length of the thrust motion of the regulating unit on the side of the mass centre.
4. An equipment according to any of claims 1 to 3, c h a r a c t e r i z e d in that the regulating units (8, 9) are hydraulic cylinders.
PCT/FI1996/000246 1995-05-04 1996-05-03 Stabilization system WO1996034776A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT96913543T ATE227656T1 (en) 1995-05-04 1996-05-03 STABILIZATION SYSTEM
AU56493/96A AU5649396A (en) 1995-05-04 1996-05-03 Stabilization system
DE69624806T DE69624806D1 (en) 1995-05-04 1996-05-03 STABILIZATION SYSTEM
EP96913543A EP0824413B1 (en) 1995-05-04 1996-05-03 Stabilization system
CA002220084A CA2220084C (en) 1995-05-04 1996-05-03 Stabilization system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI952150A FI105329B (en) 1995-05-04 1995-05-04 Stability system
FI952150 1995-05-04

Publications (1)

Publication Number Publication Date
WO1996034776A1 true WO1996034776A1 (en) 1996-11-07

Family

ID=8543349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000246 WO1996034776A1 (en) 1995-05-04 1996-05-03 Stabilization system

Country Status (6)

Country Link
EP (1) EP0824413B1 (en)
AT (1) ATE227656T1 (en)
AU (1) AU5649396A (en)
DE (1) DE69624806D1 (en)
FI (1) FI105329B (en)
WO (1) WO1996034776A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0909668A1 (en) * 1997-10-15 1999-04-21 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting fluid pressure cylinders used to control pivoting of vehicle axles
GB2401851A (en) * 2003-05-20 2004-11-24 Bamford Excavators Ltd Load handling machine with working arm between front axle and cab
WO2014182220A1 (en) * 2013-05-08 2014-11-13 BAE Systems Hägglunds Aktiebolag Load-carrying frame and vehicle provided with load-carrying frame
US9738321B2 (en) 2013-06-03 2017-08-22 Ponsse Oyj Arrangement and method for enabling rotation movement between tandem or caterpillar axle and body of vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652101A (en) * 1969-12-17 1972-03-28 William J Pivonka Vehicle stabilization apparatus
US3976302A (en) * 1973-12-07 1976-08-24 Sten Ove Hammarstrand Pivoting axle system for terrain vehicles
US4099733A (en) * 1976-04-12 1978-07-11 Valmet Oy Off-the-road vehicles
EP0136910A2 (en) * 1983-10-03 1985-04-10 Standish Limited Agricultural tractors
US4580797A (en) * 1983-08-05 1986-04-08 Umea Mekaniska Ab Device at cross-country vehicles or machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652101A (en) * 1969-12-17 1972-03-28 William J Pivonka Vehicle stabilization apparatus
US3976302A (en) * 1973-12-07 1976-08-24 Sten Ove Hammarstrand Pivoting axle system for terrain vehicles
US4099733A (en) * 1976-04-12 1978-07-11 Valmet Oy Off-the-road vehicles
US4580797A (en) * 1983-08-05 1986-04-08 Umea Mekaniska Ab Device at cross-country vehicles or machines
EP0136910A2 (en) * 1983-10-03 1985-04-10 Standish Limited Agricultural tractors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0909668A1 (en) * 1997-10-15 1999-04-21 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting fluid pressure cylinders used to control pivoting of vehicle axles
US6203027B1 (en) 1997-10-15 2001-03-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure for supporting fluid pressure cylinders used to control pivoting of vehicle axles
GB2401851A (en) * 2003-05-20 2004-11-24 Bamford Excavators Ltd Load handling machine with working arm between front axle and cab
WO2014182220A1 (en) * 2013-05-08 2014-11-13 BAE Systems Hägglunds Aktiebolag Load-carrying frame and vehicle provided with load-carrying frame
US9630664B2 (en) 2013-05-08 2017-04-25 BAE Systems Hägglunds Aktiebolag Load-carrying frame and vehicle provided with load-carrying frame
US9738321B2 (en) 2013-06-03 2017-08-22 Ponsse Oyj Arrangement and method for enabling rotation movement between tandem or caterpillar axle and body of vehicle

Also Published As

Publication number Publication date
ATE227656T1 (en) 2002-11-15
AU5649396A (en) 1996-11-21
DE69624806D1 (en) 2002-12-19
FI105329B (en) 2000-07-31
EP0824413B1 (en) 2002-11-13
EP0824413A1 (en) 1998-02-25
FI952150A0 (en) 1995-05-04
FI952150A (en) 1996-11-05

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